Detach Mechanisms for Host-Based Mobility Protocols

1. A method for performing a detach procedure between a first device and a second device, the first device and the second device communicating in accordance with a host-based mobility protocol, the method comprising: receiving, at the first device, from the second device an informational exchange message to delete an IP security association between the first device and the second device, the informational exchange message further including a notify message indicating that the deletion of the IP security association is due to a detach request; in response to the notify message, automatically deleting, at the first device, (i) a mobility related state associated with the host-based mobility protocol and (ii) the IP security association between the first device and the second device, wherein the automatically deleting the mobility related state includes deleting a binding between a care-of address of the second device and a home address of the second device; and subsequent to the automatically deleting the mobility related state, transmitting, by the first device to the second device, a response message that includes a delete payload for the IP security association.

2. The method of claim 1 , wherein the mobility related state corresponds to a binding cache entry.

3. The method of claim 2 , wherein the binding cache entry comprises a care of address and a home address.

4. The method of claim 1 , wherein the first device comprises a user equipment and the second device comprises a home agent.

5. The method of claim 1 , wherein notify message is in an IKEv2 informational exchange message.

6. The method of claim 1 , wherein the response message is a IKEv2 response message.

7. The method of claim 1 , further comprising withdrawing an allocated home address of the second device.

8. A non-transitory processor readable medium storing processor readable instruction for performing a detach procedure between a first device and a second device that are configured to communicate in accordance with a host-based mobility protocol, the procedure including: receiving, at the first device from the second device, an informational exchange message requesting deletion of an IP security association between the first device and the second device, wherein the informational exchange message includes a notify message indicating that the requested deletion is based on a detach request; in response to the notify message indicating that the deletion of the IP security association is due to the detach request, automatically deleting, at the first device, (i) a mobility related state associated with the host-based mobility protocol and (ii) the IP security association between the first device and the second device, wherein the automatically deleting the mobility related state includes deleting a binding between a care-of address of the second device and a home address of the second device; and subsequent to the automatically deleting the mobility related state, transmitting, by the first device to the second device, a response message that includes a delete payload for the IP security association.

9. The non-transitory processor readable medium of claim 8 , wherein the informational exchange message and the response message are IKEv2 messages.

10. The non-transitory processor readable medium of claim 8 , wherein the procedure further comprises withdrawing an allocated home address of the second device.

11. A device for communicating with a remote device in accordance with a host-based mobility protocol, the device comprising: a network adapter configured to receive an informational exchange message requesting deletion an IP security association between the device and the remote device, wherein the informational exchange message includes a notify message indicating that the requested deletion is based on a detach request; a memory; and a processor configured to, in response to the notify message, automatically delete (i) a mobility related state associated with the host-based mobility protocol from the memory and (ii) the IP security association between the device and the remote device, wherein the processor is configured to automatically delete the mobility related state by deleting a binding between a care-of address of the second device and a home address of the remote device, wherein the network adapter is further configured to, subsequent to the automatically deleting the mobility related state, transmit to the remote device a response message that includes a delete payload for the IP security association.

12. The device of claim 11 , wherein the informational exchange message and the response message are IKEv2 messages.